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Polyimide for FOLED substrate and preparation method of polyimide

A polyimide and substrate technology, applied in the field of material science, can solve problems such as inability to meet, and achieve the effects of compact stacking, regular arrangement, simple and diverse preparation processes

Inactive Publication Date: 2020-04-28
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods can significantly improve the barrier performance of polyimide, but the barrier improvement can only be limited on the original basic material, and cannot meet the actual needs of FOLED

Method used

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  • Polyimide for FOLED substrate and preparation method of polyimide
  • Polyimide for FOLED substrate and preparation method of polyimide
  • Polyimide for FOLED substrate and preparation method of polyimide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This example provides the synthesis of 2,7-bis((4-aminophenyl)amino)-9H-xanthen-9-one:

[0040]

[0041] S1. Synthesis of intermediate 2,7-diamino-9H-xanthen-9-one:

[0042] Add 3.54g (0.01mol) of 2,7-dibromo-9H-xanthen-9-one, an appropriate amount of cuprous oxide, 50ml of NMP, and 13ml of ammonia water (29%, 0.2mol) into a 200ml pressure-resistant bottle, protected by argon, at 100 ℃ reaction, after the reaction is completed, the reaction solution is poured into ice water, extracted with dichloromethane, the solvent is removed under reduced pressure, and the product uses dichloromethane:n-hexane=2:1 (volume ratio) as the mobile phase and silica gel as the stationary phase Purified by column chromatography, the product was collected and spin-dried, and dried in vacuum at 80°C for 24h to obtain an intermediate. The intermediate structure is as follows:

[0043]

[0044] S2. Synthesis of intermediate 2,7-bis((4-nitrophenyl)amino)-9H-xanthen-9-one:

[0045]Add 2....

Embodiment 2

[0050] This example provides

[0051] Synthesis of 2-((5-aminopyridin-2-yl)amino)-6-((6-aminopyridin-3-yl)amino)-9H-xanthen-9-one:

[0052]

[0053] S1. Synthesis of intermediate 2,6-diamino-9H-xanthen-9-one:

[0054] Add 3.54g (0.01mol) of 2,6-dibromo-9H-xanthen-9-one, an appropriate amount of cuprous oxide, 50ml of NMP, and 13ml of ammonia water (29%, 0.2mol) into a 200ml pressure-resistant bottle, protected by argon, at 100 ℃ reaction, after the reaction is completed, the reaction solution is poured into ice water, extracted with dichloromethane, the solvent is removed under reduced pressure, and the product uses dichloromethane:n-hexane=2:1 (volume ratio) as the mobile phase and silica gel as the stationary phase Purified by column chromatography, the product was collected and spin-dried, and dried in vacuum at 80°C for 24h to obtain an intermediate. The intermediate structure is as follows:

[0055]

[0056] S2. Synthetic intermediates

[0057] 2-((5-nitropyridi...

Embodiment 3

[0065] This example provides the synthesis of 3,6-bis((3-aminophenyl)amino)-9H-xanthen-9-one:

[0066]

[0067] S1. Synthesis of intermediate 2,6-diamino-9H-xanthen-9-one:

[0068] Add 3.54g (0.01mol) of 2,6-dibromo-9H-xanthen-9-one, an appropriate amount of cuprous oxide, 50ml of NMP, and 13ml of ammonia water (29%, 0.2mol) into a 200ml pressure-resistant bottle, protected by argon, at 100 ℃ reaction, after the reaction is completed, the reaction solution is poured into ice water, extracted with dichloromethane, and the solvent is removed under reduced pressure, the product uses dichloromethane:n-hexane=2:1 (volume ratio) as the mobile phase and silica gel as the stationary phase Purified by column chromatography, the product was collected and spin-dried, and dried in vacuum at 80°C for 24h to obtain an intermediate. The intermediate structure is as follows:

[0069]

[0070] S2. Synthesis of intermediate 3,6-bis((3-nitrophenyl)amino)-9H-xanthen-9-one:

[0071] Add 2...

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Abstract

The invention discloses polyimide for an FOLED substrate and a preparation method of the polyimide. The method comprises the following steps: reacting an intermediate containing two halogen atom substituted xanthone with ammonia water to convert halogen atoms into amino groups; and then grafting a nitro-containing group through a Ullmann coupling reaction, then reducing to obtain the diamine monomer containing the xanthone structure, and then polymerizing the prepared diamine monomer with dianhydride to obtain the polyimide containing the xanthone structure. The planar rigid structure and thepolar groups of xanthone are creatively introduced into a polyimide main chain, the planar rigid structure is beneficial to regular stacking of molecular chains and induction of polymer crystallization, and the polar groups can enhance the hydrogen-bond interaction of the molecular chains and promote close stacking of the molecular chains so that polyimide has excellent barrier property, high glass-transition temperature and thermal stability and low thermal expansion coefficient.

Description

technical field [0001] The invention relates to the technical field of material science, more specifically, to a polyimide used for a FOLED substrate and a preparation method thereof. Background technique [0002] Organic light-emitting diodes (OLEDs) are a new generation of displays that are most likely to replace liquid crystal displays (LCDs) because of their advantages such as self-luminescence, high brightness, ultra-thin and light weight, and fast response. Flexible organic electroluminescent devices made of flexible polymer materials encapsulating OLEDs can be bent, folded, and even wearable, which is an important development direction of future display technology. However, FOLED has problems of insufficient stability and lifetime, which limits its popularization and application. When making FOLEDs, since the manufacturing process temperature of thin film transistors (TFT) generally requires the use temperature of the substrate material to be above 250°C, which is mu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G79/10C08L79/08C08J5/18C07D265/38C07D405/14
CPCC07D265/38C07D405/14C08G73/1007C08G73/1085C08J5/18C08J2379/08
Inventor 刘亦武谭井华周栋赵先清
Owner HUNAN UNIV OF TECH
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